倾斜诱导$ν= 5/2$各向异性到各向同性相变
Tilt-Induced Anisotropic to Isotropic Phase Transition at $ν= 5/2$
摘要：
适度的平面内磁场\Bpar \足以破坏在$ν= 5/2$和7/2处的分数量子化霍尔态，并用各向异性可压缩相代替它们。值得注意的是，我们发现，在较大的\Bpar \这些各向异性相本身可以被各向同性的可压缩相，让人想起复合费米子流体在$ν= 1/2$。我们提出了强有力的证据表明，这种转变是从不同的电子子带朗道水平的混合的后果。我们还报告了令人惊讶的依赖性的能隙在$ν= 5/2$和7/3上的限制电位的宽度。
英文摘要：
A modest in-plane magnetic field \Bpar\ is sufficient to destroy the fractional quantized Hall states at $ν= 5/2$ and 7/2 and replace them with anisotropic compressible phases. Remarkably, we find that at larger \Bpar\ these anisotropic phases can themselves be replaced by isotropic compressible phases reminiscent of the composite fermion fluid at $ν= 1/2$. We present strong evidence that this transition is a consequence of the mixing of Landau levels from different electric subbands. We also report surprising dependences of the energy gaps at $ν= 5/2$ and 7/3 on the width of the confinement potential.
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